For a fixed snatch block... This only changes the direction of pull and puts double the weight on the snatch block. For a 2000 lb item the line from the item to the block sees 2000 lbs and the line from the block to the winch sees 2000 lbs. Hence the snatch block sees 4000 lbs.
For a moving block.... Here the line from the snatch block to the fixed point sees 1000 lbs and the line from the block to the winch sees 1000 lbs. Hence the snatch block sees 2000 lbs.
As the angle of the line changes the equation to figure the line pull also changes.
A easy way to figure it is the count the lines hooked to the item you are trying to move. And a single pully snatch block always sees twice the line pull since it has two lines to it.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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